Means for surveying bore-holes.



PATENTED DEC. 4, 1906.

H. F. MARRIOTT. MEANS FOR SURVEYING BORE HOLES.

APPLICATION FILED APR. 29 1905.

2 SHEETS-SHEET 1.

.me/zwr; Jig/3Z @1730??? No. 837,415. PATENTED DEC. 4, 1906.

I H. F. MARRIOTT.

MEANS FOR SURVEYING BORE HOLES.

APPLIOATION FILED APE-29.1905.

2 SHEETS-SHEET 2.

. UNITED STATES HUGH FREDERICK MARRIOTT,

OF PARKTOWN, TRANSVAAL.

MEANS FOR SURVEYING BORE-HOLES- Specification of Letters Patent.

' Patented Dec. 4, 1906.

Original application filed August 30,1904, Serial No. 222,777. Divided and this application filed April29,1905. .Serial No. 269,040- 1 T0 all'whom it may concern.-

Be it known that I, HUGH FREDERIcK MARRIOTT, a subject of the King of Great Britain, residing at Parktown, near 'Johan nesburg, Transvaal, South Africa, have invented certain new and useful Improvements in Means for Surveying Bore-Holes, of which the following is a specification] Thepresent invention has reference to devices for surveying bore-holes, and more especially to an instrument for determining the direction of and measuring the amount of dip. J

In a prior application for patent filed on the 30th day of August, 1904, under Serial No.

222,777, and of which this case is a division,

I describe an instrument in which electricity is employed for liquefying at the point to be surveyed a solid contained Within the instrument, the solid serving on resolidification to retain in its recording or indicating position a magnetic compass and mirror from which the desired information or readin may be obtained after the Withdrawal of t e instrument from the bore-hole.

My present improvements have especial reference to this form of instrument, and they relate to the construction and arrangement of the magnetic compass and mirror.

In the arrangement described and illustrated in my prior application, Serial No. 222,777, the pin which forms the support for the magnetic compass is rigidly attached to the bottom plug, which closes the lowerend of the tube or cylinder in'which the compass is contained.

Now the object of this invention is to improve this construction and to increase the sensitiveness and efficiency of the instrument and to construct it so that the com ass is not so liable to displacement when te instrument is brought into use.

The improvements will now be described in detail by aid of the accompanying sheet of drawings, in which sufficient of the instru ment is illustrated to fully illustrate the improvements.

In the drawings, Figure 1 represents a ver tical part-sectional elevation of the tube and magnetic compass arranged and fixed therein, and Fig. 2 is a plan. Fig. 3 is an elevation of the device for reading the declination of the bore-hole from the mirror with the base-board removed, Fig. 4 is a plan of Fig.

3 with the base-board in position, and Fig. 5 is a side elevation also with the base-board removed.

the hollow,.conical, or bell-shapedbase Z.- M is the mirror, fixed to the top of the mag-.

netic needle L. The magnetic needle L is balanced upon the point of the verticallydisposed pin K. The in K is carried by a semicircular band 0, w ich band 0 at its extremitiesis attached to' an inner ring 0.

Round the ring 0 is arranged an outer andconcentric ring N, to which the inner ringO is pivotally attached. by the two pivots or pins m, located diametrically opposite each other. The outer rin N is ivotally carried by screws 12., screwed t ougl i the tube A into the ring N. The pivots formed by the screws n for the ring N are also arranged diametrically opposite each other and in a plane at right angles to the plane of the pivots m for the inner ring 0.

By the construction above described the concentric rings N 0 being free to move on the pivots n m in two planes at right angles the pin K is thereby maintained in a vertical position in relation to the magnetic needle L and mirror M.

In like manner to the com ass described in my prior application, Serial 0. 222,777, the mirror M bem fixedto the ma netic needle L, thedeclination of said mirror om the hori zontal (a plane at right angles to the longitudinal axis of the tube A) represents the direction of and measures the dip, which can be easily determined. a

In Figs. '3, 4, and 5, illustrating the arrangement for determiningfrom the mirror the declination of the bore-hole, 1 represents a horizontal board which has fixed to it at two op osite ends two upri hts or sufpports.

2, wine support a vertical oard 3, ormed .with a semicircular upper edge 1*, marked At the denwith degrees like a protractor. ter of the protractor 3 and in proximity to the bottom edge is fixed a clam ing device consistingof-a s indle 4, carrying one half 5 x of a clamp in W 'ch the instrument, consist-w l '9 is a washer placed on the spindle 4 at one.

side of the vertical board 3, and 10 awing-nut screwed onto the threaded extremity of the spindle 4 at the'other side of the board 3. The wing-nut 10 serves for clamping the clamp and instrument to the protractqr. .On

the needle 4, at the foot ofthe board 3,-is fixed .a pointer 11, which rotates with the spindle .4 and serves for determining the number ofdegrees of dip or declination of-the bore-hole.

' To the top of thesboard 3, at the center or. lmmedlate'ly above thehole provided for-theclamp-spindle 4,.is a bracket 12, Which-is bent over to the front of the protractor. To the outer-extremity of the bracket '12 is .fixed a tubular eyepiece 13, to the inside of which are .fixed cross-wires-the point of intersection of which coincides with the center -of the clamp 56 when the-pointer 11 is vertical.

and fixed mithe clamp 5 6 and the pointer 11 placed perpendicular. The operator then looks through the eyepiece 113 and moves the the mirror v and when in this posltion the pointer 1 1 inditofirotect-lby Letters *Patent,-is

- an instrument of the nature indicatedp nesses. In using this device the tube A is placed pointer 11 until thereflection of the eyeis seen throu%]41 the eyepiece 13 in the center of The mirror is then horizontal,

cates on the protractor "3 in degrees read firom the vertical theldeclination of the hole. It may be clamped in this position by the win -nut 10. I v at 'I claim as my invention, and'desire n for surveying bore-holes, in combination, the tube or hollow cylinder A, the magnetic needle L formed with thehollow, conical or bellshaped base l, the mirrorM attached to the needle L, the outer Nand pivots 'n pivctally supportin itat two diametrically opposite points in file tube A, the inner concentric ring 0 and the pivot s 'm pivoting it to the outer ring N .at two diametrically-opposite points anda-t rightanglesto the pivots n, the

semicircular "band 0 and :the vertical in K fixed thereto said pin projecting into t e recess in the under side of the conical or bellshaped base 1- to sup ort the needle L and 'mirror M, substantial yes-described.

.In'w'itness whereofl have hereunto set my hand in the presence of :two subscribing'wit- HUGH FREDERICK MARRIQTT.

Witnesses: v

1GHAS.OVENDALE, R. OvENnmLn. 

